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870 results for “Ordovician”
Fig. 1 in First report on the occurrence of Neseuretinus and Ovalocephalus trilobites in the Middle Ordovician of Iran
Fig. 1. Geographical map (A) showing the position of fossil locality in the Derenjal Mountains north of Tabas and stratigraphical column (B) through Section B in the upper part of the Shirgesht Formation, showing stratigraphical ranges of selected trilobite, ostracod, and conodont species (after Ghobadi Pour et al. 2006). The dashed line for Neseuretinus birmanicus indicates the position of specimens collected lose on the surface and therefore only in approximate stratigraphical position.
Fig. 5 in A review of the endocerid cephalopod Protocyptendoceras from the Floian (Lower Ordovician) of the Eastern Cordillera, Argentina
Fig. 5. Paleobiogeographical distribution of Protocyptendoceras and the related genera Anthoceras Teichert and Glenister, 1954, Notocycloceras Teichert and Glenister, 1954, Lobendoceras Teichert and Glenister, 1954 and Ventroloboceras Teichert and Glenister, 1954 (see text for explanation). AN, Antarctica; AUST, Australia; AM, Armorican Massif; BM, Bohemian Massif; B, Baltica; G, Gondwana; IN, India; L, Laurentia; SCH, South China; NCH, North China; S, Siberia; CAB, Argentinian part of the Central Andean Basin (paleogeographical map after Astini et al. 2007).
Fig. 5 in A new genus of Late Ordovician-Early Silurian pentameride brachiopods and its phylogenetic relationships
Fig. 5. Transverse serial sections of two paratype specimens of Parastrophina portentosa (Nikitin and Popov in Nikitin et al. 1996), Upper Ordovician, Dulankara Regional Stage, sample F−1014, Sortan−Manai, northern Betpak−Dala desert, Central Kazakhstan. A. NMW 98.28G.383, juvenile specimen. B. NMW 98.28G.377. Numbers indicate distances from apex.
Fig. 3 in A new genus of Late Ordovician-Early Silurian pentameride brachiopods and its phylogenetic relationships
Fig. 3. Sketches of selected serial sections of Protanastrophia repanda gen. et sp. nov. ROM 57738, paratype, Attawapiskat Formation, locality AK2c, Akimiski Island, Nunavut, Canada. Numbers denote distance from apex.
Fig. 6 in A new genus of Late Ordovician-Early Silurian pentameride brachiopods and its phylogenetic relationships
Fig. 6. Stratigraphic ranges and inferred phylogenetic relationships of 19 parastrophinid species and other selected syntrophiidine species based on one of six equally parsimonious cladograms (A) and emended topography of the Parastrophina cluster shown in strict consensus tree (B). Numbered nodes are supported by the character states listed in Appendix 3.
Fig. 2 in A new genus of Late Ordovician-Early Silurian pentameride brachiopods and its phylogenetic relationships
Fig. 2. Shell measurements of Protanastrophia repanda gen. et sp. nov. Sample AK2c, Attawapiskat Formation, Akimiski Island, Hudson Bay region, Nunavut, Canada.
Fig. 4 in A new genus of Late Ordovician-Early Silurian pentameride brachiopods and its phylogenetic relationships
Fig. 4. Pentameride brachiopod Parastrophina portentosa (Nikitin and Popov in Nikitin et al. 1996), Upper Ordovician, Dulankara Regional Stage, sample F−1014, Sortan−Manai, northern Betpak−Dala desert, Central Kazakhstan. A. NMW 98.28G.351, paratype, dorsal (A1), ventral (A2), anterior (A3), and lateral (A4) views of asymmetrical shell. B. NMW 98.28G.352, paratype, dorsal (B1), ventral (B2), lateral (B3), and anterior (B4) views. C. NMW 98.28G.353, paratype, lateral (C1) and anterior (C2) views of smooth, asymmetrical shell. D. NMW 98.28G.354, paratype, dorsal (D1), ventral (D2), lateral (D3), and anterior (D4) views of asymmetrical, juvenile shell.
Fig. 1 in A new genus of Late Ordovician-Early Silurian pentameride brachiopods and its phylogenetic relationships
Fig. 1. Pentameride brachiopod Protanastrophia repanda gen. et sp. nov.; Attawapiskat Formation, uppermost Telychian, Akimiski Island, Hudson Bay region, Nunavut, Canada. A. ROM 57734, holotype, dorsal (A1), ventral (A2), lateral (A3), posterior (A4), and anterior (A5) views. B. ROM 57735, paratype, dorsal (B1), ventral (B2), lateral (B3), posterior (B4), and anterior (B5) views of strongly asymmetrical, anteriorly costate shell. C. ROM 57736, paratype, dorsal (C1), ventral (C2), lateral (C3), posterior (C4), and anterior (C5) views of asymmetrical shell without costae. D. ROM 57737, paratype, dorsal (D1), ventral (D2), lateral (D3), posterior (D4), and anterior (D5) views of relatively small, largely symmetrical shell. E. ROM 57738, paratype, micrograph of transverse serial section, showing low ventral median septum, broad V−shaped spondylium, smooth alate plates, and discrete inner hinge plates, 0.7 mm from apex (refer to Fig. 3).
Fig. 10 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 10. Longitudinal section of Archigeisonoceras picus sp. nov., NRM−Mo 14455, Limbata−Limestone, Resmo (Öland) (A) and Nilssonoceras nilssoni (Boll, 1857), NRM−Mo 3328, Segerstad−Limestone, Hulsterstadkanalen (Öland) (B) showing the development of cameral and endosiphuncular deposits (× 0.55).
Fig. 6 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 6. Schematic sketches of the cross section of the shell. Shell ornamentation of Orthoceras (A), Nilssonoceras (B), and Kinnekulloceras (C) (aperture to the right).
Fig. 3 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 3. Variation of the body chamber impressions in adult Orthoceras bifeovatum Noetling (right flanks, apex down, × 0.7). A. NMB C. 5383, coll. Remelé 1241. B. NRM−Mo 154270. C. NMB C. 5384, coll. Remelé. D. NRM−Mo 154268.
Fig. 2 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 2. Longitudinal sections of the apical parts of the phragmocone of Orthoceras. A. Orthoceras sp. from Czerwińsk near Kwidzyn, N Poland, NMB C. 5381, Lasnamägian (apical diameter 3.3 mm). B. Orthoceras regulare from Bydgoszcz, Poland, NMB C. 5382(apical diameter 4.5 mm). Endosiphuncular and cameral deposits dotted.
Fig. 9 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 9. Longitudinal section of the siphuncle of Nilssonoceras latisiphonatum sp. nov., NRM−Mo 158037, holotype (diameter of the siphuncle 10 mm). The siphuncle shows different areas of sparite (dotted: fin grained calcite, medium hatched: medium grained sparite, coarsely hatched: coarse grained sparite) which are interpreted as residues of the spherulitic prismatic layer of the connecting ring (dotted), the endosiphonal annuli (medium hatched) and the endosiphuncular lining (coarsely hatched).
Fig. 5 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 5. Histogram of the entire number of observed Orthoceras (n = 66) classified by the expansion rate (e). The frequency peak between e = 0.04 (a = 2.3°) – 0.05 (a = 0.9°) represents O. bifeovatum Noetling and O. regulare Schlotheim, the frequency peak between e = 0.09 (a = 5.1°) – 0.1 (a = 5.7°) represents O. scabridum Angelin.
Fig. 8 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 8. Histogram of the entire number of observed specimens of Nilssonoceras nilssoni (Boll) (n = 130) classified by the expansion rate (e).
Fig. 4 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 4. Variation of the body chamber impressions and aperture in adult Orthoceras scabridum Angelin (A–D, × 0.8; E, × 1). A. NRM−Mo 3140. B. NRM−Mo 155513. C. NRM−Mo 155520. D. NRM−Mo 154202. E. NRMMo 155508.
Fig. 7 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 7. Longitudinal section of the apical part of the phragmocone of Archeisonoceras folkeslundense sp. nov. (NRM−Mo 155476, holotype, diameter of the shell 10 mm).The cameral and endosiphuncular deposits are dotted. Note the short cyrtochoaniticseptal necks.
Fig. 12 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 12. Polished sections of the siphuncle. A. Archigeisonoceras folkeslundense sp. nov., NRM−Mo 3223, Källa (Öland), showing the structure of the connectig ring and the layered structure of the endosiphuncular annuli, × 35. B. Archigeisonoceras picus sp. nov., NRM−Mo 14455, Resmo (Öland), apical part of the phragmocone, × 8. C. Nilssonoceras nilssoni (Boll), NRM−Mo 3328, Hulterstad Kanalen (Öland), middle part of the phragmocone, × 12. D. Kinnekulloceras kinnekullense (Foord), NRM−Mo 155245, Utby (Dalarna), × 12. E. Archigeisonoceras picus sp. nov., NRM−Mo 14455, Resmo (Öland), middle part of the phragmocone, × 8. F. Nilssonoceras nilssoni (Boll), NRM−Mo 3328, Hulterstad Kanalen (Öland), apical part of the phragmocone with irregular endosiphuncular annuli and lining and strong cameral deposits, × 12. G. Arionoceras lotskirkense sp. nov., NRM−Mo 3296, Hällar (Öland), × 25.
Fig. 11 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 11. Polished sections of the siphuncle. A. Ctenoceras schmidti (Noetling), NRM−Mo 160668b, Kandel (Estonia). Note the calcified connecting ring and the thin lining of a sphaerolitic−prismatic layer at the outer surface of the connecting ring, × 25. B. Archigeisonoceras folkeslundense sp. nov., NRM−Mo 3223, Källa (Öland). Note the porous structure of the calcified connecting ring and the sphaerolitic−prismatic layer, × 10. C. Orthoceras scabridum Angelin, NRM−Mo 154771, Södre Bäck (Öland), × 30. D. Plagiostomoceras fragile sp. nov., NRM−Mo 160559, Gardslösa (Öland), × 6.3. E. Archigeisonoceras repplingense sp. nov., NRM−Mo 3285 not numbered, Hälludden (Öland), note the asymmetrical development of the endosiphuncular annuli, × 18. F. Archigeisonoceras repplingense, NRM−Mo 3284, Hälludden (Öland), apical part, × 18. G. Archigeisonoceras repplingense sp. nov., NRM−Mo 3293, Torp (Öland), note the thin sphaerolithic−prismatic layer of the connecting ring, × 22.
Fig. 4 in A low diversity shallow water lingulid brachiopod-gastropod association from the Upper Ordovician of Kyrgyz Range
Fig. 4. The lingulid brachiopod Tunisiglossa almalensis Popov and Mambetov, sp. nov. from the Almaly Formation, Caradocian (Upper Ordovician) of Kyrgystan. Schematic representation of ventral (A) and dorsal (B) valve interior showing position of muscle scars, mantle canals and a pedicle nerve impression.
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